Hyperbolic Match Output
Maker:SCIENTIFIC INSTRUMENT COMPANY (SIC) (USA)
Model:Electro-Vector Log-Log No. 1570
Scales Front: || Sr, Sθ & Sθ, P', P || Q, CF, CI, C || D, DF, LL2, LL3 || Note: LL1' is at end of C; Sr is radians; Sθ is deg.
Scales Back: || Sh2, Sh1, A || B, K, Th, C || D, Tr1, Tr2, db || Note: db is 20 lgx
Gauge Marks: π is on A, B, C, D, CF,and DF; M is on A and B; C and C1 are on C and D; π/4 is on the A & B scales; e is on LL2 and LL3.
Cursor Front: Has the scale names imprinted, but no gauge marks.
Cursor Back: Has the scale names imprinted, but no gauge marks.
Construction: 25 cm.; Plastic face on laminated wood ; Cursor not framed. Adjustable metal brackets.
Information: Note is similar to Relay No, 157 See 87.